package com.taiyo.modules.api.interceptor;


import org.apache.commons.lang.StringUtils;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import com.taiyo.common.exception.RRException;
import com.taiyo.modules.api.annotation.AuthIgnore;
import com.taiyo.modules.sys.entity.SysUserEntity;
import com.taiyo.modules.sys.service.ShiroService;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 权限(Token)验证
 */
@Component
public class AuthorizationInterceptor extends HandlerInterceptorAdapter {
	@Autowired
    private ShiroService shiroService;

    public static final String USER_KEY = "userId";

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        AuthIgnore annotation;
        if(handler instanceof HandlerMethod) {
            annotation = ((HandlerMethod) handler).getMethodAnnotation(AuthIgnore.class);
        }else{
            return true;
        }

        //如果有@IgnoreAuth注解，则不验证token
        if(annotation != null){
            return true;
        }

        //从header中获取token
        String token = request.getHeader("token");
        //如果header中不存在token，则从参数中获取token
        if(StringUtils.isBlank(token)){
            token = request.getParameter("token");
        }

        //token为空
        if(StringUtils.isBlank(token)){
            throw new RRException("token不能为空");
        }

        //根据accessToken，查询用户信息
        SysUserEntity userToken = shiroService.queryByToken(token);
        //token失效
        if(userToken == null ){
            throw new IncorrectCredentialsException("token失效，请重新登录");
        }

        //设置userId到request里，后续根据userId，获取用户信息
        request.setAttribute(USER_KEY, userToken.getUserId());
        return true;
    }
}
